Fender Blues Junior IV, (Used)

The Fender Blues Junior IV is a compact tube guitar amplifier head designed to deliver classic Fender tube tone in a portable package. Its all‑tube design uses a 12‑inch speaker and typically runs around 15 watts of output, making it well‑suited for bedroom playing, rehearsals, small gigs, and studio work where rich, dynamic tube response is desired at manageable volume levels. The amp’s voicing and circuitry are based on Fender’s heritage of warm cleans and expressive breakup, giving it a versatile voice across blues, rock, jazz, and Americana styles.

Controls on the Blues Junior IV include Volume, Treble, Middle, Bass, Reverb, and Master Volume, allowing players to shape overall loudness, EQ, and ambience. The Volume control feeds the preamp section to set the character and drive, while the Master Volume adjusts the power‑amp level for overall output. The three‑band EQ (Treble, Middle, Bass) provides broad tonal shaping, and the onboard spring reverb adds depth and spatial texture without the need for external effects.

Hardware features a rugged enclosure with a front‑firing speaker grille and top‑mounted control panel for easy access during performance. Tube circuitry — often including a pair of 12AX7 preamp tubes and EL84 power tubes — provides responsive touch and natural compression, giving the amp its signature feel. The Blues Junior IV also typically includes a single 1/4″ input jack and a speaker output for connecting external cabinets, making it adaptable for expanded setups. This combination of classic tube tone, expressive controls, and compact design makes the Fender Blues Junior IV a popular choice for players seeking warm, dynamic sound in a portable amp.